Andros Island, the largest island in the Bahamas, holds a key to where Hurricane Matthew will have the most impact on Florida.
All of Andros is within Matthew's forecast cone from the National Hurricane Center as of midday Wednesday. The storm's direction around that island will determine the path Matthew will take.
If the hurricane stays to the east and north of Andros Island as it roars through late Wednesday or early Thursday, "the storm's impact on Miami and Dade County should be less," said Craig Setzer, chief meteorologist at CBS4 in Miami.
While it may miss Miami in that scenario, it will have more of an impact on areas near or north of Palm Beach, he said.
If it goes directly over Andros, "then it'll have a more severe impact on the Miami-Dade area," Setzer said. As of midday Wednesday, he said the least likely possibility is that the storm will track to the south and/or west of Andros and then hit Miami directly, finally tracking across the Florida Peninsula.
"Based on the storm's present position, Andros is a nice marker on the map," said Setzer, adding that it helps his viewers to keep that in mind during the many hours of storm coverage.
He said the island itself will not act to disrupt the storm since it's very flat with no mountains. Setzer also noted that Andros is only a marker for this specific storm and not a rule to apply to any other hurricane situation.